Effect of intermediate Minkowskian evolution on CMB bispectrum
Abstract
We consider a non-inflationary early Universe scenario in which relevant scalar perturbations get frozen out at some point, but then are defrosted and follow a long nearly Minkowskian evolution before the hot era. This intermediate stage leaves specific imprint on the CMB 3-point function, largely independent of details of microscopic physics. In particular, the CMB bispectrum undergoes oscillations in the multipole l space with roughly constant amplitude. The latter is in contrast to the oscillatory bispectrum enhanced in the flattened triangle limit, as predicted by inflation with non-Bunch-Davies vacuum. Given this and other peculiar features of the bispectrum, stringent constraints imposed by the Planck data may not apply. The CMB 3-point function is suppressed by the inverse duration squared of the Minkowskian evolution, but can be of observable size for relatively short intermediate Minkowskian stage.
- Authors:
-
- Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312, Moscow (Russian Federation)
- Publication Date:
- OSTI Identifier:
- 22373662
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2014; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COSMOLOGICAL INFLATION; FUNCTIONS; LIMITING VALUES; MATHEMATICAL EVOLUTION; OSCILLATIONS; PERTURBATION THEORY; SCALARS; SPACE; UNIVERSE
Citation Formats
Mironov, S. A., Rubakov, V. A., and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. Effect of intermediate Minkowskian evolution on CMB bispectrum. United States: N. p., 2014.
Web. doi:10.1088/1475-7516/2014/04/015.
Mironov, S. A., Rubakov, V. A., & Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. Effect of intermediate Minkowskian evolution on CMB bispectrum. United States. https://doi.org/10.1088/1475-7516/2014/04/015
Mironov, S. A., Rubakov, V. A., and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. 2014.
"Effect of intermediate Minkowskian evolution on CMB bispectrum". United States. https://doi.org/10.1088/1475-7516/2014/04/015.
@article{osti_22373662,
title = {Effect of intermediate Minkowskian evolution on CMB bispectrum},
author = {Mironov, S. A. and Rubakov, V. A. and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru},
abstractNote = {We consider a non-inflationary early Universe scenario in which relevant scalar perturbations get frozen out at some point, but then are defrosted and follow a long nearly Minkowskian evolution before the hot era. This intermediate stage leaves specific imprint on the CMB 3-point function, largely independent of details of microscopic physics. In particular, the CMB bispectrum undergoes oscillations in the multipole l space with roughly constant amplitude. The latter is in contrast to the oscillatory bispectrum enhanced in the flattened triangle limit, as predicted by inflation with non-Bunch-Davies vacuum. Given this and other peculiar features of the bispectrum, stringent constraints imposed by the Planck data may not apply. The CMB 3-point function is suppressed by the inverse duration squared of the Minkowskian evolution, but can be of observable size for relatively short intermediate Minkowskian stage.},
doi = {10.1088/1475-7516/2014/04/015},
url = {https://www.osti.gov/biblio/22373662},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2014,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}
}